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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-37194] Number of docsExamined is not considered for index selection</title>
                <link>https://jira.mongodb.org/browse/SERVER-37194</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;We should consider the number of documents scanned between different plans being evaluated. At the very least, we should use that to resolve ties between plans.&lt;/p&gt;

&lt;p&gt;This is critical for Big Data systems reading data via Spark Connector that partitions data by _id for reading. Example:&lt;/p&gt;

&lt;p&gt;For the query&lt;/p&gt;
&lt;p/&gt;
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&lt;p/&gt;
&lt;p&gt;all indexes below will tie, although it is beyond obvious which one should be selected (the difference is of course dramatic when we&apos;re talking about TB&apos;s of data):&lt;/p&gt;
&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{date:1, _id:1}&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{date:1, _id:1, email:1}&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;{date:1, _id:1, some_other_email:1}&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;</description>
                <environment></environment>
        <key id="606806">SERVER-37194</key>
            <summary>Number of docsExamined is not considered for index selection</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="3">Duplicate</resolution>
                                        <assignee username="backlog-query-optimization">Backlog - Query Optimization</assignee>
                                    <reporter username="alex.komyagin@mongodb.com">Alexander Komyagin</reporter>
                        <labels>
                            <label>bonsai</label>
                            <label>query-44-grooming</label>
                    </labels>
                <created>Tue, 18 Sep 2018 21:25:41 +0000</created>
                <updated>Mon, 11 Sep 2023 10:38:17 +0000</updated>
                            <resolved>Mon, 11 Sep 2023 10:38:17 +0000</resolved>
                                                                    <component>Querying</component>
                                        <votes>2</votes>
                                    <watches>22</watches>
                                                                                                                <comments>
                            <comment id="5693233" author="JIRAUSER1261429" created="Mon, 11 Sep 2023 10:38:17 +0000"  >&lt;p&gt;The fix was implemented in PM-3316 via &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-79400&quot; title=&quot;Implement number of documents tie breaking heuristics&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-79400&quot;&gt;&lt;del&gt;SERVER-79400&lt;/del&gt;&lt;/a&gt;.&lt;/p&gt;</comment>
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            <issuekey id="145089">SERVER-14423</issuekey>
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